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sentinel.go
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sentinel.go
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/*
*
* Copyright 2020 waterdrop authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package sentinel
import (
"net/http"
"github.com/UnderTreeTech/waterdrop/pkg/server/http/middlewares/ratelimit"
"github.com/alibaba/sentinel-golang/api"
"github.com/alibaba/sentinel-golang/core/base"
"github.com/gin-gonic/gin"
)
// Sentinel return rate limit middleware
func Sentinel(opts ...ratelimit.Option) gin.HandlerFunc {
limitOption := ratelimit.Apply(opts)
return func(c *gin.Context) {
limitPath := c.Request.Method + ":" + c.FullPath()
if limitOption.Strategy != nil {
limitPath = limitOption.Strategy(c)
}
entry, err := api.Entry(limitPath, api.WithResourceType(base.ResTypeWeb), api.WithTrafficType(base.Inbound))
if err != nil {
if limitOption.Fallback != nil {
limitOption.Fallback(c)
} else {
c.AbortWithStatus(http.StatusTooManyRequests)
}
return
}
defer entry.Exit()
c.Next()
}
}